netdev - Re: [Bugme-new] [Bug 8325] New: -j REDIRECT --to-ports 1000-1009, always first choosen

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Message-ID: <46230F06.4020201@trash.net>
Date:	Mon, 16 Apr 2007 07:52:06 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Denys <denys@...p.net.lb>
CC:	wijata@...-labs.com, Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>
Subject: Re: [Bugme-new] [Bug 8325] New: -j REDIRECT --to-ports 1000-1009,
 always first choosen

Denys wrote:
> On Mon, 16 Apr 2007 07:30:33 +0200, Patrick McHardy wrote
> 
>>That makes sense with using multiple IPs (and we support doing that),
>>but whats the point of load-balancing to differenet *ports*?
> 
> 
> Easy - for example i have my own TCP acceleration solution, which is using 
> REDIRECT, then getsockopt/SO_ORIGINAL_DST to get original IP, then forwarding 
> to compressed tunnel, stripping unneeded bytes (oh, my expensive satellite 
> bandwidth). This way for example i can do some kind load-balancing for 
> satellite bandwidth. 

That sounds rather hackish, you might as well do it in your application.

I just noticed we don't accept the random option for DNAT/REDIRECT yet,
but that is easily fixed (I'll queue a patch for 2.6.22). Then this
will work and select ports from the range randomly:

iptables -t nat -A INPUT .. -j REDIRECT --to-ports 1000:1010 --random
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